Danfoss D9h, Руководство по эксплуатации

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9.4.26 WARNING/ALARM 27, Brake Chopper Fault
Cause
The brake transistor is monitored during operation, and if a short circuit occurs, the brake function is disabled, and a warning is
issued. The drive is still operational, but since the brake transistor has short-circuited, substantial power is transmitted to the brake
resistor, even if it is inactive.
Troubleshooting
Remove the power to the drive and remove the brake resistor.
9.4.27 WARNING/ALARM 28, Brake Check Failed
Cause
The brake resistor is not connected or not working.
Troubleshooting
Check parameter 2-15 Brake Check .
9.4.28 ALARM 29, Heat Sink Temp
Cause
The maximum temperature of the heat sink is exceeded. The temperature fault is not reset until the temperature drops below a
defined heat sink temperature. The trip and reset points are different based on the drive power size.
Troubleshooting
Check for the following conditions:
The ambient temperature is too high.
The motor cables are too long.
Incorrect airflow clearance above and below the drive.
Blocked airflow around the drive.
Damaged heat sink fan.
Dirty heat sink.
9.4.29 ALARM 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase U.
9.4.30 ALARM 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase V.
9.4.31 ALARM 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase W.
AQ262139143212en-000301 / 130R0879 | 147 Danfoss A/S © 2021.10
Maintenance, Diagnostics, and
Troubleshooting
VLT® AutomationDrive FC 302
Operating Guide